/*   
Copyright 2006 - 2010 Intel Corporation

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

using System;
using System.Text;

namespace OpenSource.UPnP.AV.CdsMetadata
{
	/// <summary>
	/// Value types can never have a value of NULL and so it
	/// became necessary to wrap some value types (in object forms) 
	/// so that DIDL-Lite xml fragments that left values unassigned
	/// could be represented.
	/// </summary>
	interface IValueType : IComparable
	{
		/// <summary>
		/// Indicates that the value is actually present.
		/// </summary>
		bool IsValid { get; }
		/// <summary>
		/// Returns the actual value. The value is not
		/// reliable if IsValid is false.
		/// </summary>
		object Value { get; }
	}
}
